Method test_is_tarfile_keeps_position

Lib/test/test_tarfile.py:429–439

(self)

            self.assertTrue(tarfile.is_tarfile(io.BytesIO(fobj.read())))

    def test_is_tarfile_keeps_position(self):
        # Test for issue44289: tarfile.is_tarfile() modifies
        # file object's current position
        with open(self.tarname, "rb") as fobj:
            tarfile.is_tarfile(fobj)
            self.assertEqual(fobj.tell(), 0)

        with open(self.tarname, "rb") as fobj:
            file_like = io.BytesIO(fobj.read())
            tarfile.is_tarfile(file_like)
            self.assertEqual(file_like.tell(), 0)

    def test_empty_tarfile(self):
        # Test for issue6123: Allow opening empty archives.